ACTION=="add", SUBSYSTEM=="input", RUN+="/usr/local/bin/touchpadtoggle.sh"
ACTION=="remove", SUBSYSTEM=="input", RUN+="/usr/local/bin/touchpadtoggle.sh"

#!/bin/bash
notify-send "Test"

#!/bin/bash
sudo -u $USER DISPLAY=:0 notify-send "Test"

sudo udevadm control -R

$ lsusb
 $ udevadm monitor --property

$ lsusb
 Bus 002 Device 004: ID 192f:0916 Avago Technologies, Pte.

$ udevadm monitor --property
[.......]
UDEV  [25696.403834] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22/event4 (input)
ACTION=add
DEVLINKS=/dev/input/by-id/usb-192f_USB_Optical_Mouse-event-mouse /dev/input/by-path/pci-0000:00:1d.7-usb-0:3.4:1.0-event-mouse
DEVNAME=/dev/input/event4
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22/event4
ID_BUS=usb
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_MODEL=USB_Optical_Mouse
ID_MODEL_ENC=USBx20Opticalx20Mouse
ID_MODEL_ID=0916
ID_PATH=pci-0000:00:1d.7-usb-0:3.4:1.0
ID_PATH_TAG=pci-0000_00_1d_7-usb-0_3_4_1_0
ID_REVISION=0200
ID_SERIAL=192f_USB_Optical_Mouse
ID_TYPE=hid
ID_USB_DRIVER=usbhid
ID_USB_INTERFACES=:030102:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=192f
ID_VENDOR_ENC=192f
ID_VENDOR_ID=192f
MAJOR=13
MINOR=68
SEQNUM=2567
SUBSYSTEM=input
USEC_INITIALIZED=5875811

UDEV  [25696.407470] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22/mouse0 (input)
ACTION=add
DEVLINKS=/dev/input/by-id/usb-192f_USB_Optical_Mouse-mouse /dev/input/by-path/pci-0000:00:1d.7-usb-0:3.4:1.0-mouse
DEVNAME=/dev/input/mouse0
       *^^^ that's my device name ! ^^^*
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22/mouse0
*^^^ that's my device path ! ^^^*
ID_BUS=usb
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_MODEL=USB_Optical_Mouse
ID_MODEL_ENC=USBx20Opticalx20Mouse
ID_MODEL_ID=0916
^^^^^^^^^^^^^^^^
ID_PATH=pci-0000:00:1d.7-usb-0:3.4:1.0
ID_PATH_TAG=pci-0000_00_1d_7-usb-0_3_4_1_0
ID_REVISION=0200
ID_SERIAL=192f_USB_Optical_Mouse
ID_TYPE=hid
ID_USB_DRIVER=usbhid
ID_USB_INTERFACES=:030102:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=192f
ID_VENDOR_ENC=192f
ID_VENDOR_ID=192f
^^^^^^^^^^^^^^^^^
MAJOR=13
MINOR=32
SEQNUM=2566
SUBSYSTEM=input
USEC_INITIALIZED=5875565

$ udevadm info -a -p $(udevadm info -q path -n /dev/input/mouse0)
                                                         ^^^^^^^
                                                   may be different for you
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22/mouse0':
    KERNEL=="mouse0"
    SUBSYSTEM=="input"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003/input/input22':
    KERNELS=="input22"
    SUBSYSTEMS=="input"
    DRIVERS==""
    ATTRS{name}=="USB Optical Mouse"
    ATTRS{phys}=="usb-0000:00:1d.7-3.4/input0"
    ATTRS{uniq}==""
    ATTRS{properties}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0/0003:192F:0916.0003':
    KERNELS=="0003:192F:0916.0003"
    SUBSYSTEMS=="hid"
    DRIVERS=="hid-generic"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4/2-3.4:1.0':
    KERNELS=="2-3.4:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bInterfaceProtocol}=="02"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3.4':
    KERNELS=="2-3.4"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="3.4"
    ATTRS{idVendor}=="192f"
    ATTRS{speed}=="1.5"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="2"
    ATTRS{devnum}=="8"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="98mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="a0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0200"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="62095"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0916"
    ATTRS{bDeviceClass}=="00"
    ATTRS{product}=="USB Optical Mouse"

ACTION=="add",SUBSYSTEMS=="usb",ATTRS{idVendor}=="192f",ATTRS{idProduct}=="0916",RUN+="/usr/local/bin/touchpadtoggle.sh"